lol that's familiar, I had the same with a window sprayer that I told very clearly, loudly and repeatedly: "NO"
when he went ahead anyway I put the wipers on, squirted him with the window washer, and when he didn't stop I pulled up the handbrake, put the hazards on and got out the car and chased him a few meters
it was one of those malnourished tik-koppe so I was like twice his size, think he realised he was in no position for a physical altercation
not proud nor ashamed of that moment, no means no